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Ongororo yeBack Drilling Technology mune Yakakwira Speed PCB Dhizaini
2024-04-08 17:37:03
Nei tichifanira kuita Backdrill dhizaini?
Chekutanga, izvo zvikamu zve-high-speed interconnect link ndezvi:
① Kutumira kupera chip (kurongedza uye PCB kuburikidza)
② Sub kadhi PCB wiring
③ Sub card connector
④ Backboard PCB wiring
⑤ Inopikisa sub card connector
⑥ Inopikisa divi diki kadhi PCB wiring
⑦ AC coupling capacitance
⑧ Receiver chip (kurongedza uye PCB kuburikidza)
Iyo yepamusoro-yekumhanya chiratidzo chekubatanidza chezvigadzirwa zvemagetsi chakaomarara, uye matambudziko ekusawirirana kwe impedance anowanzoitika munzvimbo dzakasiyana dzekubatanidza, zvichikonzera kubuda kwechiratidzo.
Yakajairika impedance discontinuity mapoinzi mune yakakwira-kumhanya yekubatanidza zvinongedzo:
(1) Chip kurongedza: Kazhinji, iyo PCB wiring wide mukati meiyo chip yekurongedza substrate yakanyanya kutetepa kupfuura iyo yenguva dzose PCB, zvichiita kuti impedance control iome;
(2) PCB kuburikidza ne: PCB kuburikidza inowanzoita capacitive mhedzisiro ine yakaderera hunhu impedance, uye inofanirwa kuve yakanyanya kutariswa uye yakagadziridzwa muPCB dhizaini;
(3) Connector: Dhizaini yemhangura yekubatanidza yekubatanidza mukati meiyo yekubatanidza inopesvedzerwa neaviri ma mechanical kuvimbika uye kushanda kwemagetsi, saka inofanira kutsvaga chiyero pakati pezviviri.
Iyo PCB kuburikidza inowanzogadzirwa senge-maburi (kubva kumusoro kumusoro kusvika kuzasi layer). Kana mutsara wePCB unobatanidza nzira uchiendeswa pedyo nepamusoro pepamusoro, "stub" bifurcation ichaitika kuburikidza nePCB interconnect link, zvichikonzera kuratidzwa kwechiratidzo uye kukanganisa unhu hwechiratidzo. Iyi pesvedzero ine simba guru pazvikwangwani zvinomhanya zvakanyanya.
Troduction kuBackdrill Processing Methods
Tekinoroji yekuchera kumashure inoreva kushandiswa kwekudzika kwekudzora nzira dzekuchera, uchishandisa yechipiri nzira yekuchera kuburitsa kunze kweStub hole madziro ekubatanidza kana chiratidzo kuburikidza.
Sezvinoratidzwa mumufananidzo uri pasi apa, mushure mokunge gomba raumbwa, iyo yakawandisa Stub yePCB kuburikidza-gomba inobviswa nekuchera kwechipiri kubva "kumashure". Ehe, iyo dhayamita yeiyo backdrill bit inofanira kunge yakakura kupfuura iyo kuburikidza-gomba saizi, uye kudzika kwekushivirira kwedanho rekuchera kunofanirwa kuve kwakavakirwa pamusimboti we "kusakuvadza kubatana pakati pePCB gomba uye wiring", kuve nechokwadi. kuti "yakasara yakareba stub iduku sezvinobvira", iyo inonzi "depth control drilling".
Schematic dhizaini ye kuburikidza-gomba BackDrill chikamu
Izvo zviri pamusoro idhizaini yedhizaini ye kuburikidza-gomba BackDrill chikamu. Rutivi rworuboshwe chiratidzo chenguva dzose kuburikidza ne-buri, kurudyi kune dhiyabhorosi yedhiyabhorosi yeburi-shure mushure meBackDrill, ichiratidza kuchera kubva pasi pasi kusvika kune chiratidzo chechiratidzo panowanikwa trace.
Kumashure kuchera tekinoroji inogona kubvisa iyo parasitic capacitance mhedzisiro inokonzerwa negomba madziro stubs, kuve nechokwadi chekuenderana pakati peiyo wiring uye impedance paburi-paburi muchiteshi chinongedzo, kuderedza chiratidzo chechiratidzo, uye nekudaro kuvandudza chiratidzo chechiratidzo.
Backdrill parizvino ndiyo yakanyanya kudhura tekinoroji inova ndiyo inonyanya kushanda mukuvandudza chiteshi chekufambisa. Iko kushandiswa kwemashure ekuchera tekinoroji kuchawedzera mutengo wePCB kugadzirwa kune imwe nhanho.
Kurongwa kweSingle Board Back Drilling
Kuchera kumashure kunosanganisira 2 marudzi: single-sided back drilling uye kaviri-sided back drilling.
Single sided drilling inogona kupatsanurwa kuita back drilling kubva kumusoro kana pasi pasi. Iyo PIN gomba reiyo yekubatanidza plug pini inogona kungodzoserwa kumashure kubva kudivi rakatarisana nechiso panowanikwa chinongedzo. Kana ma-high-speed signal connectors akarongwa pamativi ese epamusoro uye epasi pePCB, kudzoreredza-maviri-kumashure kunodiwa.
Zvakanakira zvekuchera kumashure
1) Deredza kupindira kweruzha;
2) Kuvandudza chiratidzo chekuvimbika;
3) Local bhodhi ukobvu kunoderera;
4) Deredza kushandiswa kwekuvigwa / bofu kuburikidza nekuderedza kuoma kwePCB kugadzirwa.
Ndeipi basa rekuchera musana?
Basa rekuchera kumashure nderokuchera kunze kuburikidza ne-gole zvikamu zvisina chero chekubatanidza kana basa rekufambisa kudzivirira kuratidzira, kuparadzira, kunonoka, nezvimwewo mukufambisa kwechiratidzo chepamusoro.
Back drilling process
a. Pane maburi ekumisikidza paPCB, ayo anoshandiswa kwekutanga kuchera chinzvimbo uye gomba rekutanga kuchera kwePCB;
b. Electroplate the PCB mushure mekuchera gomba rekutanga, uye firimu rakaoma rinonamira gomba rekuisa pamberi pe electroplating;
c. Gadzira muenzaniso wekunze pane electroplated PCB;
d. Ita pateni electroplating paPCB mushure mekugadzira iyo yekunze layer pateni;
e. Shandisa buri rekumisikidza rakashandiswa nekutanga kucheresa kuseri kwenzvimbo, uye shandisa chibooreso chekuchera kumashure;
f. Geza gomba rakaboorwa kumashure nemvura kuti ubvise chero marara ekuchera mukati.